Ming Lei b347689ffb blk-mq-sched: improve dispatching from sw queue ... SCSI devices use host-wide tagset, and the shared driver tag space is often quite big. However, there is also a queue depth for each lun( .cmd_per_lun), which is often small, for example, on both lpfc and qla2xxx, .cmd_per_lun is just 3. So lots of requests may stay in sw queue, and we always flush all belonging to same hw queue and dispatch them all to driver. Unfortunately it is easy to cause queue busy because of the small .cmd_per_lun. Once these requests are flushed out, they have to stay in hctx->dispatch, and no bio merge can happen on these requests, and sequential IO performance is harmed. This patch introduces blk_mq_dequeue_from_ctx for dequeuing a request from a sw queue, so that we can dispatch them in scheduler's way. We can then avoid dequeueing too many requests from sw queue, since we don't flush ->dispatch completely. This patch improves dispatching from sw queue by using the .get_budget and .put_budget callbacks. Reviewed-by: Omar Sandoval <osandov@fb.com> Signed-off-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>		2017-11-01 08:20:02 -06:00
..
partitions	partitions/ldm: switch to use uuid_t	2017-06-05 16:59:14 +02:00
badblocks.c	block: Add fallthrough markers to switch statements	2017-06-21 11:46:07 -06:00
bfq-cgroup.c	bfq: Declare local functions static	2017-09-01 13:56:37 -06:00
bfq-iosched.c	block, bfq: fix unbalanced decrements of burst size	2017-10-09 09:54:58 -06:00
bfq-iosched.h	Merge branch 'for-4.14/block' of git://git.kernel.dk/linux-block	2017-09-07 11:59:42 -07:00
bfq-wf2q.c	block, bfq: guarantee update_next_in_service always returns an eligible entity	2017-08-31 08:20:31 -06:00
bio-integrity.c	block: remove unnecessary NULL checks in bioset_integrity_free()	2017-10-06 13:03:12 -06:00
bio.c	block: fix Sphinx kernel-doc warning	2017-10-16 13:00:12 -06:00
blk-cgroup.c	blkcg: check pol->cpd_free_fn before free cpd	2017-10-10 09:04:47 -06:00
blk-core.c	block: Fix a race between blk_cleanup_queue() and timeout handling	2017-10-30 13:28:10 -06:00
blk-exec.c	block: introduce new block status code type	2017-06-09 09:27:32 -06:00
blk-flush.c	block: update comments to reflect REQ_FLUSH -> REQ_PREFLUSH rename	2017-08-25 10:36:54 -06:00
blk-integrity.c	block: switch bios to blk_status_t	2017-06-09 09:27:32 -06:00
blk-ioc.c	Merge branch 'for-linus' of git://git.kernel.dk/linux-block	2017-03-03 10:53:35 -08:00
blk-lib.c	block: cope with WRITE ZEROES failing in blkdev_issue_zeroout()	2017-10-25 12:28:23 -06:00
blk-map.c	blk-map: call blk_queue_bounce from blk_rq_append_bio	2017-06-27 12:13:21 -06:00
blk-merge.c	block: replace bi_bdev with a gendisk pointer and partitions index	2017-08-23 12:49:55 -06:00
blk-mq-cpumap.c	blk-mq: map queues to all present CPUs	2017-07-24 10:01:31 -06:00
blk-mq-debugfs.c	block: remove QUEUE_FLAG_STACKABLE	2017-10-05 15:22:59 -06:00
blk-mq-debugfs.h	mq-deadline: add debugfs attributes	2017-05-04 08:25:17 -06:00
blk-mq-pci.c	blk-mq-pci: add a fallback when pci_irq_get_affinity returns NULL	2017-08-18 08:08:14 -06:00
blk-mq-rdma.c	block: Add rdma affinity based queue mapping helper	2017-08-08 14:58:03 -04:00
blk-mq-sched.c	blk-mq-sched: improve dispatching from sw queue	2017-11-01 08:20:02 -06:00
blk-mq-sched.h	blk-mq: introduce .get_budget and .put_budget in blk_mq_ops	2017-11-01 08:20:02 -06:00
blk-mq-sysfs.c	blk-mq: untangle debugfs and sysfs	2017-05-04 08:24:13 -06:00
blk-mq-tag.c	blk-mq: Make blk_mq_reinit_tagset() calls easier to read	2017-08-18 08:36:58 -06:00
blk-mq-tag.h	blk-mq-tag: kill unused tag enums	2017-10-01 01:26:21 -06:00
blk-mq-virtio.c	blk-mq: provide a default queue mapping for virtio device	2017-02-27 20:54:05 +02:00
blk-mq.c	blk-mq-sched: improve dispatching from sw queue	2017-11-01 08:20:02 -06:00
blk-mq.h	blk-mq-sched: improve dispatching from sw queue	2017-11-01 08:20:02 -06:00
blk-settings.c	block: Warn if blk_queue_rq_timed_out() is called for a blk-mq queue	2017-08-23 12:02:30 -06:00
blk-softirq.c	smp: Avoid using two cache lines for struct call_single_data	2017-08-29 15:14:38 +02:00
blk-stat.c	blk-stat: delete useless code	2017-10-10 13:48:14 -06:00
blk-stat.h	blk-stat: kill blk_stat_rq_ddir()	2017-04-21 07:56:23 -06:00
blk-sysfs.c	block: fix warning when I/O elevator is changed as request_queue is being removed	2017-08-28 10:52:44 -06:00
blk-tag.c	block: Unexport blk_queue_end_tag()	2017-08-18 08:36:58 -06:00
blk-throttle.c	blk-throttle: fix null pointer dereference while throttling writeback IOs	2017-10-10 13:09:34 -06:00
blk-timeout.c	block: Fix a race between blk_cleanup_queue() and timeout handling	2017-10-30 13:28:10 -06:00
blk-wbt.c	block,bfq: Disable writeback throttling	2017-10-09 08:29:21 -06:00
blk-wbt.h	block: Make writeback throttling defaults consistent for SQ devices	2017-04-19 08:49:03 -06:00
blk-zoned.c	block: replace bi_bdev with a gendisk pointer and partitions index	2017-08-23 12:49:55 -06:00
blk.h	blk-mq: document the need to have STARTED and COMPLETED share a byte	2017-10-04 11:22:24 -06:00
bounce.c	block: remove the queue_bounce_pfn helper	2017-06-27 12:13:45 -06:00
bsg-lib.c	bsg-lib: don't free job in bsg_prepare_job	2017-09-25 08:56:05 -06:00
bsg.c	bsg: remove #if 0'ed code	2017-08-29 10:50:30 -06:00
cfq-iosched.c	block/cfq: cache rightmost rb_node	2017-09-08 18:26:49 -07:00
cmdline-parser.c	block: remove unrelated header files and export symbol	2014-01-21 20:18:26 -08:00
compat_ioctl.c	compat_hdio_ioctl: Fix a declaration	2017-08-31 17:32:41 -04:00
deadline-iosched.c	block, scheduler: convert xxx_var_store to void	2017-08-28 10:01:08 -06:00
elevator.c	elevator: allow name aliases	2017-10-25 12:36:50 -06:00
genhd.c	Merge branch 'for-4.14/block' of git://git.kernel.dk/linux-block	2017-09-07 11:59:42 -07:00
ioctl.c	block: move CAP_SYS_ADMIN check in blkdev_roset()	2017-10-25 12:25:00 -06:00
ioprio.c	block: Add fallthrough markers to switch statements	2017-06-21 11:46:07 -06:00
Kconfig	block: Add rdma affinity based queue mapping helper	2017-08-08 14:58:03 -04:00
Kconfig.iosched	block, bfq: add full hierarchical scheduling and cgroups support	2017-04-19 08:30:26 -06:00
kyber-iosched.c	block: kyber: check if there are requests in ctx in kyber_has_work()	2017-11-01 08:20:02 -06:00
Makefile	block: Add rdma affinity based queue mapping helper	2017-08-08 14:58:03 -04:00
mq-deadline.c	mq-deadline: add 'deadline' as a name alias	2017-10-25 12:36:55 -06:00
noop-iosched.c	block: move existing elevator ops to union	2017-01-17 10:03:33 -07:00
opal_proto.h	block: sed-opal: Set MBRDone on S3 resume path if TPER is MBREnabled	2017-09-11 09:45:52 -06:00
partition-generic.c	block: fix a crash caused by wrong API	2017-09-25 08:56:05 -06:00
scsi_ioctl.c	block: Change argument type of scsi_req_init()	2017-06-20 19:27:14 -06:00
sed-opal.c	block: sed-opal: Set MBRDone on S3 resume path if TPER is MBREnabled	2017-09-11 09:45:52 -06:00
t10-pi.c	t10-pi: Move opencoded contants to common header	2017-07-03 16:56:25 -06:00